Uncertainties in material and geometric strength and load variables

摘要

Uncertainty in the basic load strength variables of a ship structure can significantly affect structural performance and safety. Variations in strength, load and load effects greatly impact the reliability of a structural system. Understanding and including this variation, or uncertainty, in the design and analysis of ship structures requires the use of structural reliability-based design and assessment methodologies. For example, the design strength is based on nominal values for variable such as yield stress of the mate- Rial, plate thickness, modulus of elasticity, etc.